Just got a boat with a Johnson 48 and have some questions. I am new to boating so any help would be GREATLY appreciated.<br /><br />The model number is J48ESLERD. I know the J is for Johnson, the 48 is for the horsepower, what does the rest mean??<br /><br />I have dual 12 gal removable tanks. When running the engine, are the vents supposed to be open or closed?<br /><br />What is the proper fuel/oil mixture and plug gap? <br /><br />I have had the boat out a couple times and it runs great. However the last time we were out, I suddenly lost all top end power. It seemed like a fuel problem, but everyting checked out. Connections were tight and fuel bulb was a bit soft, but nothing major.<br /><br />Lastly, a friend of mine (who is supposed to know about boat motors) came over and we ran the motor a bit with a hose hooked up for the cooling. he was checking some stuff and I noticed a greasy like substance around the center of the prop. Is this the oil from the exhaust building up or is it something to worry about.<br /><br />Thans for the help folks. I look forward to receiving the manual I ordered for the motor soon so that maybe I can give some answers instead of just asking!!!
